Expose different task runner in RenderFrame for convenience

content/public/renderer/render_frame.h

Index: content/public/renderer/render_frame.h
diff --git a/content/public/renderer/render_frame.h b/content/public/renderer/render_frame.h
index b0211bf64e365cb7b4a7e9eab0bdfbc317ef89a3..68b6086561d2af54788938841fbd7ba4311bd17c 100644
--- a/content/public/renderer/render_frame.h
+++ b/content/public/renderer/render_frame.h
@@ -20,6 +20,10 @@
 #include "third_party/WebKit/public/platform/WebPageVisibilityState.h"
 #include "third_party/WebKit/public/web/WebNavigationPolicy.h"
 
+namespace base {
+class SingleThreadTaskRunner;
+}
+
 namespace blink {
 class WebFrame;
 class WebLocalFrame;
@@ -244,6 +248,10 @@ class CONTENT_EXPORT RenderFrame : public IPC::Listener,
   // requests navigation until the browser responds with the result.
   virtual bool IsBrowserSideNavigationPending() = 0;
 
+  virtual base::SingleThreadTaskRunner* GetTimerTaskRunner() = 0;

[jochen (gone - plz use gerrit), 2017/01/19 17:31:09]

please add comments that explain the differences, and when to use which (or
point at documentation about that)

[altimin, 2017/01/19 17:49:51]

Done.

+  virtual base::SingleThreadTaskRunner* GetLoadingTaskRunner() = 0;
+  virtual base::SingleThreadTaskRunner* GetUnthrottledTaskRunner() = 0;
+
  protected:
   ~RenderFrame() override {}